*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
.top{
    width: 300px;
    margin: auto;
}
.top li{
    font-size: 14px;
    font-weight: bold;
    font-family: "华文宋体";
    color: dimgrey;
}
.top .nav > li{
    position: relative;
    list-style: none;
    display: inline-block;
    cursor: pointer;
    padding: 10px;
}
.top .nav .active{
    border-bottom: 3px solid orangered;
}
.top .nav .active:hover{

}
.top .nav > .active ::after{
    content: "";
    border-bottom: 1px solid paleturquoise;
    position: absolute;
    width:100%;
    left:0;
    bottom: -1px;
}
.top .banner > div{
    display: none;
}
.top .banner > .active{
    display:block ;
    font-size: 14px;
    height: 50px;
}
.active p{
    font-size: 14px;
    font-family: "华文细黑";
    font-weight: bold;
    color: #000;
}
